1 /*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * RC2 low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <openssl/rc2.h>
17 #include "rc2_local.h"
18
19 static const unsigned char key_table[256] = {
20 0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed, 0x28, 0xe9, 0xfd, 0x79,
21 0x4a, 0xa0, 0xd8, 0x9d, 0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e,
22 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2, 0x17, 0x9a, 0x59, 0xf5,
23 0x87, 0xb3, 0x4f, 0x13, 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32,
24 0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b, 0xf0, 0x95, 0x21, 0x22,
25 0x5c, 0x6b, 0x4e, 0x82, 0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c,
26 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc, 0x12, 0x75, 0xca, 0x1f,
27 0x3b, 0xbe, 0xe4, 0xd1, 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26,
28 0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57, 0x27, 0xf2, 0x1d, 0x9b,
29 0xbc, 0x94, 0x43, 0x03, 0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7,
30 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7, 0x08, 0xe8, 0xea, 0xde,
31 0x80, 0x52, 0xee, 0xf7, 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a,
32 0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74, 0x4b, 0x9f, 0xd0, 0x5e,
33 0x04, 0x18, 0xa4, 0xec, 0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc,
34 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39, 0x99, 0x7c, 0x3a, 0x85,
35 0x23, 0xb8, 0xb4, 0x7a, 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31,
36 0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae, 0x05, 0xdf, 0x29, 0x10,
37 0x67, 0x6c, 0xba, 0xc9, 0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c,
38 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9, 0x0d, 0x38, 0x34, 0x1b,
39 0xab, 0x33, 0xff, 0xb0, 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e,
40 0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77, 0x0a, 0xa6, 0x20, 0x68,
41 0xfe, 0x7f, 0xc1, 0xad,
42 };
43
44 #if defined(_MSC_VER) && defined(_ARM_)
45 # pragma optimize("g",off)
46 #endif
47
48 /*
49 * It has come to my attention that there are 2 versions of the RC2 key
50 * schedule. One which is normal, and another which has a hook to use a
51 * reduced key length. BSAFE uses the latter version. What I previously
52 * shipped is the same as specifying 1024 for the 'bits' parameter. Bsafe
53 * uses a version where the bits parameter is the same as len*8
54 */
RC2_set_key(RC2_KEY * key,int len,const unsigned char * data,int bits)55 void RC2_set_key(RC2_KEY *key, int len, const unsigned char *data, int bits)
56 {
57 int i, j;
58 unsigned char *k;
59 RC2_INT *ki;
60 unsigned int c, d;
61
62 k = (unsigned char *)&(key->data[0]);
63 *k = 0; /* for if there is a zero length key */
64
65 if (len > 128)
66 len = 128;
67 if (bits <= 0)
68 bits = 1024;
69 if (bits > 1024)
70 bits = 1024;
71
72 for (i = 0; i < len; i++)
73 k[i] = data[i];
74
75 /* expand table */
76 d = k[len - 1];
77 j = 0;
78 for (i = len; i < 128; i++, j++) {
79 d = key_table[(k[j] + d) & 0xff];
80 k[i] = d;
81 }
82
83 /* hmm.... key reduction to 'bits' bits */
84
85 j = (bits + 7) >> 3;
86 i = 128 - j;
87 c = (0xff >> (-bits & 0x07));
88
89 d = key_table[k[i] & c];
90 k[i] = d;
91 while (i--) {
92 d = key_table[k[i + j] ^ d];
93 k[i] = d;
94 }
95
96 /* copy from bytes into RC2_INT's */
97 ki = &(key->data[63]);
98 for (i = 127; i >= 0; i -= 2)
99 *(ki--) = ((k[i] << 8) | k[i - 1]) & 0xffff;
100 }
101
102 #if defined(_MSC_VER)
103 # pragma optimize("",on)
104 #endif
105
